Vilkku, I haven't seen a 1606 error since XP, especially with JAVA installs. I can't tell you the exact path to fix your GPU issue. What I can tell you is that 1606 errors have nothing to do with a 'network'. After uninstalling the software, there's two areas that usually cause this error - (1) The Windows Installer (MSI or MSP) located in C:\Windows\Installer folder for your software; (2) A related registry entry for this installer both of which you'll need to remove. And, you will probably need to check "Documents and Settings" Application folders for related software entries. You'll find an .EXE but most likely a .MSI file from a previous install you'll need to remove. Also, check your "program" folder's directory for left over folders, files and duplicate install folders. REVO Uninstaller is a good program that will remove most of these entries but not alway ALL leftovers. Afterwards, CCleaner can removed some registry entries and temp files but it usually doesn't get them all. It definitely will not solve the 1606 error.
I wish I could give you the exact locations. Hopefully, someone who has had this issue can help. In the meantime, go to the .EXE you're using for the install; hover over and get the meta tag data that gives the issuer's name or a good descriptive idea as to what you'll search for in the Installer folder; when you find it, it looks simillar to this: 3da5d3.msi; you'll need to remove any installer associated with your software install(s) (For my input here, it's MSI and MSP files only. I'm not sure if the same applies to .INF files since those are for drivers); Highly recommend you save the files somewhere at least temporarily; Type regedit in the "Run" box and press enter, the registry opens; Before anything else, highlight "My Computer", click "File" on the menu bar and then "Export" to save a copy of the entire registry; now go to HYEY_LOCAL_MACHINE, click the + and then highlight "SOFTWARE"; on the menu line under "Edit" select "Find", type your MSI/MSP file name into the "Find What" space with "Keys, Values, Data" checked and "Match..." unchecked, click "Find Next", once found, a page opens for your file's registry entry that controls the install; I recommend you save this entry to a file folder before deleting it: (DISCLAIMER!!! If you have a problem working with the registry, DO NOT "DO AS I SAY" in the registry, you can get a 'dead' machine if something goes wrong. If you haven't already, you may wish to back up your entire drive. It's about the only way you can recover from corrupting the registry.)
Hope this will give you a start. You may wish to save this and break out the steps I've jumbled together. Good luck.
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